Dipper-front construction



SePt- 2. w. M. BAGER E AL DIPPER FRON'J CONSTRUCTION Original Filed Sept. 2, 1925 Will/am MBqyer Werner le/rma/ IN VEN TORJ. f KW A TTORNEYS.

Patented Sept. 13, 1927.

UNITED STATES PATENT, orrlcs.

WILLIAM M. BAGER, WERNER LEHMAN, AND FREDERICK CARL RUHLOEF, OF SOUTH MILWAUKEE, WISCONSIN.

DIPPER-FRONT CONSTRUCTION.

Original application filed September 2,

This case is a division of our copending case, Serial No. 54,025, filed on or about September 2, 1925.

This invention relates todippers used on excavating machinery, and has particular reference to the construction, arrangement and means of attachment of the teeth that are applied to the upper or cutting edge of the dipper front, and to the corresponding form and construction of said dipper front.

Our dipper-front construction is novel in themanner in which the two walls, of which the front is composed, are held apart by horizontal ribs or webs, and are joined together between the teeth to form a cutting edge. The front is therefore virtually a double trussed structure. Although in the accompanying drawings our dipper-front is shown aving the arch form which is approved for certain classes of excavating work, the invention is as easily applicable to the straight form of front whichis desirable in such work as coal-stripping.

"With our form of dipper-front, it is also possible to place a tooth considerably nearer to the corner of the dipper than is usual.

This is especially desirable in rock work,

and serves to reduce the wear upon the lip at the corners.

The two plates of the front, together with the horizontal webs which space them apart, form sockets providing a very rigid holding for the teeth. The joinings of the two plates at the lip hold the teeth any sidewise motion. Our very rigidly trussed sockets therefore serve better than four-walled sockets, which latter would be extremely ditficult to cast for proper fit of the tooth. A four-walled socket would require either a careful machining of at least two of the walls, or else securing the tooth in place by bolts or similar means, which is troublesome; whereas, in the case of our socket, it is a simple matter to chip the edges of our webs as to fit our teeth, and thus hold them in place by friction alone. Furthermore inasmuch as our sockets open into each other, it is much easier to free them of dirt than if they each formed a closed receptacle. This ease of cleaning is especially evident at the bottom, where, on two opposite sides, the socket is accessible from the out side.

I plates with respect to the lip,

effectively against 1925, Serial No. 54,025. Divided and this application filed August Serial No. 127,852.

At the base of each tooth-socket we provide a hole, for the insertion of a tool to drive the tooth out of the socket when it is desired to repoint or replace it. As our sockets are all identically of the same standard form, any tooth may be used 1n any socket, since our invention contemmakmg all teeth of the same form in that portion of their length which is inserted in the socket. It is, however, quite within the domain of our invention to provide teeth whose cutting portion may be any one of several different standard forms, the particular form used being dependent upon the character of the work to be done. The same teeth will also be applicable to different fpgms of excavator, such as shovel, dredge, e

Since our tooth is held frictionally, instead as heretofore by some such means as a bolt, it also becomes possible to advance the tooth by inserting a filler or spacer within the socket at the base of a tooth which has been shortened. by wear.

Furthermore, the bolting-flanges described in our said copending application, by-

means of which the halves of our dip er are joined and which serve as stiffening anges, also furnish a rigid support for the base of the teeth or for the filler 'or spacer just described.

Other objects and advantages of our invention will be evident to those skilled in the art, and therefore need not be herein more specifically set forth.

The invention consists in the novel parts and in the combinations and arrangements defined in the appended claims, and of which one embodiment is exemplified in the accompanying drawings, which are hereinafter particularly described and explained.

Throughout, the same reference number is applied to the same or to similar members. The sections in all cases are as viewed in the direction of the arrows.

Figure 1 is a plan view of a dipper showing our tooth socket.

igure 2 is a front elevation showing the digper teeth in place.

igure 3 is a section intermediate the dipper 2teeth, taken along the line 3-3 of Figure Figure 4 is a section taken along the line 4-4 of Figure 2, showing our dipper tooth in osition.

ur improved dipper, as described in the said copending application, Serial No. 54,025, of which this case is a division, consists of an upper, or digging member 1, and a lower, or carrying member 2, the plane of division 3 being horizontal.

The upper member 1 has integral therewith, around the periphery of its open lower end and projecting outwardly from the sides of the dipper, a bolting flange 4., Whose lower face is finished and abuts the finished upper face of bolting flange 5, the latter being at the upper periphery of the lower member 2 and integral therewith. These two bolting flanges l, 5, are exactly similar in plan, and both lie entirely outside of the volume de fined by the inner faces of the dipper. They are both provided with a number of boltholes, drilled to template for the reception of the bolts 6 which hold the two members together. The front part of said flange 4: serves also as a web to join together the two walls of the front, to be hereinafter referred to.

In the upper member 1, the dipper front consists of an outer wall 7 and an inner wall 8, of which walls the upper portions, at all points except at the spaces occupied by the teeth 9, converge to form a single cutting edge or lip 10. This lip is reinforced by a thickening of the outer wall, shown at 11.

The teeth 9 occupy sockets 12, two opposite walls of which are formed by the outer and inner walls 7, 8, of the dipper front. There are no lateral walls to the sockets, the teeth being held laterally in place by the lip-forming joining of the two said walls 7, 8 at their upper part adjacent the lip 10, in conjunction withethe upper and lower reinforcing webs, which webs are numbered 13, 14 respectively. These reinforcing webs, except at the spaces occupied by the teeth 9, extend horizontally, from the outer wall 7 to the inner wall 8, in planes perpendicular to the greatest length of the teeth.

At the spaces occupied by theteeth 9, the outer wall 7 is prolonged downward, as

shownat 15, Figures 2 and 4, to a continuity,

with,-itjlie.lupper' bolting flange 4; while'at, the-interspaces between the teeth the outer wall '7 is not continued below the lower re-.

inforcing webv It. ,Thus there is formed, at each interspace, an aperture lti, as clearly shown intllfigureyfiptof'facilitate the insertion or removal of the bolt 6.

At the base of each tooth socket 12, and

central to the base of each tooth 9, the bolting flanges 4, 5, have a hole 17 drilled through them. As the teeth are merely frictionally held in the socket, they may be easily removed for repointin or substitution, by inserting a short bar in the hole 17 and driving the bar with a hammer. When the tooth wears and thus becomes shorter, it may be advanced with respect to the socket, by removing the tooth, inserting in the base of the socket a filler or spacer 18, of the same cross section as the tooth, the tooth being then replaced.

The aperture 16 in the outer wall 7 at the interspaces between the bases of the teeth will serve "to clean out any dirt that may accumulate between the inner and the outer walls; for it is to be noticed that, when the teeth are removed, the space between the said walls is one continuous space.

From the foregoing it is evident that we have provided a dipper front construction that, while relatively light in weight and economical in cost, is very strongly reinforced; besides being equipped with a cutting tooth that is simple in construction, interchangeable to any socket, easily attached and easily removed for replacement or repointing, and rigidly held in its operative position.

Having now illustrated and described one embodiment of our invention, we wish it to be understood that we do not purpose to be limited to the particular construction shown and described, but rather that we reserve to ourselves the right to make any modifications or changes that are within the scope of the appended claims.

We claim: r

1. In a dipper or similar excavating unit,

the combination of: digging teeth; spaced inner and outer walls between which the teeth fit; and webs substantially parallel to the smallest cross section of said teeth, said webs serving to space said walls apart, to hold said teeth against lateral movement, and to reinforce that part of the dipper formed by the two walls.

and to reinforce that part of the dipper formed by the two walls; said walls also converging anduniting between said teeth, thus forming a cutting lip for the dipper, said lip serving the same purposes as said webs.

3. In a dipper or similar excavating unit, the combination of: digging teeth; spaced inner and outer walls between which the teeth fit; webs substantially parallel to the smallest cross section of said teeth, said webs serving to space said walls. apart, to hold said teeth against lateral movement, and to reinforce that part of the dipper formed by the two walls; said walls also converging and uniting between said teeth, thus forming a cutting lip for the dipper, said lip serving the same purposes as said webs; and a web joining sa'id walls together beneath said; teeth. s

4. In a dipper or similar excavating unit, the combination of: digging teeth;-spaced inner and outerwalls between which the teeth fit; said walls. converging and uniting between said teeth, thus forming a cutting lip for the dipper, said lip serving to space said walls apart, to hold said teeth against lateral movement, and to reinforce that part of the dipper formed by the two walls.

5. In a dipper or similar excavating unit, the combination of: digging teeth; spaced tially parallel to the smallest cross section of 2-";

said teeth, said webs servingto space said walls apart, to hold said teeth against lateral movement, and to reinforce that part of the dipper formed by the two walls.

In testimony whereof. they aflix their sig- 25 natures.

WILLIAM M. BAGER. WERNER LEHMAN. FREDERICK CARL RUHLOFF. 

